Truvativ 9 Speed Alloy 64mm BCD
Truvativ

Truvativ 9 Speed Alloy 64mm BCD

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A lightweight Truvativ 24T inner chainring engineered for 9-speed MTB triples. 64mm 4-bolt BCD aluminum construction delivers reliable low‑gear shifts and long service life.

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Product Details

Overview & Technology

Truvativ's 24T inner chainring (PN 390167, MPN 11.6215.093.000, SRAM ID CR-MLEG-64-A1) is a purpose-built replacement for 9-speed mountain bike triple cranksets that use a 64mm 4-bolt BCD. Designed as the low-range inner cog, this chainring gives you a compact, durable option to restore crisp shifting and preserve chainline on trail and technical climbs. The ring is manufactured from lightweight aluminum and finished in black to resist corrosion and hide wear. Its tooth profile is optimized for 9-speed chains, and the 64mm bolt circle diameter fits many MTB triple crank spiders — making it a straightforward swap when your original inner ring is worn or damaged.

Key Features & Construction

Precision construction: Crafted from lightweight aluminum with a protective black finish, this inner ring balances low weight and strength — ideal where reliability matters but rotors, tires and suspension already add mass. The 4‑bolt 64mm BCD is a standard triple configuration that provides firm, wobble-free mounting. • 24 teeth: Low-range gearing for steep climbs and technical sections. • 64mm, 4-bolt BCD: Compatibility with many MTB triple cranks. • 9-speed tooth profile: Shaped specifically for reliable chain engagement with 9-speed chains. • Durable finish: Black coating protects against corrosion and abrasion in wet, gritty conditions.

Fit, Compatibility & Installation

This Truvativ inner ring fits 4-bolt cranks with a 64mm BCD designed for MTB triple setups. It is an inner-position ring only — not intended as an outer or middle ring — and is profiled for 9-speed drivetrains. Always check your crank's bolt pattern and spacing before purchase. Installation is straightforward: remove chainring bolts, swap the worn ring for the Truvativ part, and torque bolts evenly to the crank manufacturer's specification (typical range ~8–10 Nm for many ring bolts). If you run narrow/wide or alternating chainrings, verify chainline and ramping to maintain smooth front shifting.

Who This Chainring Is For

This ring is ideal for mountain riders who run a 9-speed triple drivetrain and need a low-range replacement — riders restoring an older bike, keeping a fleet rolling, or wanting an OEM-matched option. It suits trail, cross-country and light enduro riders who prioritize dependable climbing gears and predictable shifting under load. If you race vintage 9-speed setups, maintain commuter triples, or rebuild bikes with original-spec components, this Truvativ 24T inner chainring gives a direct, affordable replacement without guessing compatibility or having to regear.

Key Features

  • ✓ 24-tooth inner ring tuned for low-range climbing gears on MTB triples
  • ✓ 64mm 4-bolt BCD for direct replacement on many triple cranksets
  • ✓ Aluminum construction keeps weight low while maintaining strength
  • ✓ 9-speed tooth profile ensures reliable engagement with 9-speed chains
  • ✓ Black protective finish resists corrosion and hides trail wear
  • ✓ OEM SRAM/Truvativ model ID (CR-MLEG-64-A1) for fit confidence
  • ✓ Lightweight spare — 0.09 lb / slim shipping footprint

Specifications

BCD 64
Chainring Bolts 4
Chainring Comp. MTB triple
Teeth 24
Material Aluminum
Position Inner
Primary Color Black
Speed 9

Product Identifiers

Vendor Item # 11.6215.093.000
UPC 710845413834

Frequently Asked Questions

Will this chainring fit my crankset?

This ring fits 4-bolt crank spiders with a 64mm BCD designed for MTB triple setups. Check your crank's bolt circle diameter and that you require an inner-position 24T ring before ordering. If unsure, provide your crank model or a photo and we'll help confirm fit.

Is this chainring compatible with 10- or 8-speed chains?

The tooth profile is optimized for 9-speed chains for best shifting performance. While a 10- or 8-speed chain may physically run, shifting performance and chain retention may be reduced — we recommend using a 9-speed chain for optimal results.

What torque should I use when installing the ring?

Follow your crank manufacturer's recommended torque for chainring bolts. A common range for many systems is about 8–10 Nm, but variations exist. Tighten bolts in a star pattern and re-check torque after a short test ride.

Can I use this as a middle or outer chainring?

No — this Truvativ ring is intended for the inner position of a triple crank. Tooth profiling, ramps and spacing are designed for inner-ring geometry; using it in another position will likely compromise shifting.

How durable is the aluminum finish on trails?

The black finish protects against corrosion and everyday trail abrasion, but like all aluminum rings it will show wear over time, especially with heavy chain contact or contamination. Regular cleaning and avoiding grit buildup extend life significantly.

Is this an OEM replacement for SRAM/Truvativ cranks?

Yes — the product carries the SRAM/Truvativ model ID (CR-MLEG-64-A1) and the manufacturer's MPN 11.6215.093.000, making it an OEM-spec replacement for compatible Truvativ/SRAM triple cranksets.

Buying Guide

When replacing an inner chainring on a triple MTB setup, prioritize BCD, bolt count, and speed compatibility. Measure your crank's bolt circle diameter (64mm in this case) and confirm the ring position (inner vs middle/outer). Matching the chainring's speed profile (9-speed here) to your chain ensures crisp shifting. Material and finish influence longevity and weight — aluminum inner rings offer a good trade-off between durability and mass for trail use. If you ride in muddy or abrasive conditions, check tooth wear regularly and keep the drivetrain clean to maximize chainring life.

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